You work out your abdominal, and erector spinae muscles along with a couple other intrinsic muscle groups, related to breathing and maintaining balance, and postural alignment.
ELI5; you gotta make your back and tummy strong and learn how to stand on one leg at a time without falling down. Ok ready set go.
https://www.bannerhealth.com/healthcareblog/better-me/five-reasons-why-your-core-is-so-important#:~:text=Where%20is%20your%20core%2C%20exactly,muscles%20and%20pelvic%20floor%20muscles.
Essentially any muscle that attaches to your spine and pelvis can be considered part of your core.
They are usually deep muscles and not just the abs as many people think. The abs are included, but not as critical.
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